Why can’t I just do this?

What you did does make the code more compact by eliminating the need for the third variable (question), but you still need the other two to hold the correct answer (answer) and what the user inputs (response).

You could take the concept further and eliminate all the variables by folding the values into the conditional expression, though it might be a bit more complicated to read:

for (let i = 0; i < questions.length; i++) {
  if (prompt(questions[i][0]) === questions[i][1]) {
    correctAnswers++;
  }
}

Ok, thanks!

Just to confirm, the questions variable isn’t necessary, but the answer and response variables are? An additional question; why does the answer variable need to be declared instead of just directly putting it into the conditional statement from the array itself? Does it have something to do with the variable scopes?

This works for me.

for(let i = 0; i < questions.length; i++){
  let answer = prompt(questions[i][0]);
  if(answer){
    answer = answer.toLowerCase();
  }
  if(questions[i][1] === answer){
    correct ++;
  }
}

This works for me

for (let i = 0; i<quizList.length; i++){ let quiz = prompt(quizList[i][0]); if (quiz=== quizList[i][1]){ console.log(${answer}); answer++; } }